/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.netbeans.tax.event;

import java.beans.PropertyChangeListener;

/**
 *
 * @author  Libor Kramolis
 * @version 0.1
 */
public interface TreeEventModel {

    /** Add a PropertyChangeListener to the listener list.
     * @param listener The listener to add.
     */
    public void addPropertyChangeListener (PropertyChangeListener listener);

    /** Removes a PropertyChangeListener from the listener list.
     * @param listener The listener to remove.
     */
    public void removePropertyChangeListener (PropertyChangeListener listener);
    
    /** Add a PropertyChangeListener for a specific property to the listener list.
     * @param propertyname Name of the property to listen on.
     * @param listener The listener to add.
     */
    public void addPropertyChangeListener (String propertyName, PropertyChangeListener listener);
    
    /** Removes a PropertyChangeListener for a specific property from the listener list.
     * @param propertyname Name of the property that was listened on.
     * @param listener The listener to remove.
     */
    public void removePropertyChangeListener (String propertyName, PropertyChangeListener listener);
    
    /**
     * Check if there are any listeners for a specific property.
     *
     * @param propertyName  the property name.
     * @return true if there are ore or more listeners for the given property
     */
    public boolean hasPropertyChangeListeners (String propertyName);
    
}
